these 3 derivations will be built:
  /nix/store/nygr9vsvk3c16wdpy31d3iq91jhfajdh-source.drv
  /nix/store/njnkv1kw45lbyqpfbnr9x2s5zmlab9vz-mcptoon-0.8.4.drv
  /nix/store/lg5irarh6j59anlwjl09hdyzi5kl0s03-check-mcptoon.drv